Kristy Swanson’s weight has ballooned – the first 20 lbs. piled on in the early days of her romance with her Skating with Celebrities partner, two-time Olympian Lloyd Eisler.

(”I stopped skating and we were eating all of these wonderful antipasti with cheese and crackers,” she says), before pregnancy left her at nearly 200 lbs.

Now mother to 4-month-old Magnus (”I don’t have a nanny – I want to be a hands-on mom,” she says), the 5′6″ Swanson is back down to 155 lbs. “The heaviest I’ve ever been!” she says.

Which is why she has signed a six-month, six-figure ad-campaign deal with Medifast, hoping to lose 30 lbs. and drop from a size 10 to a size 6. (Despite her arrest, Richard Zeeb, a Medifast marketing exec, says, “We stand behind Kristy 100 percent.”)

This may not seem an ideal time for a diet, but Swanson says, “I know the longer I wait the harder it will be.”

Having spent the last weeks of her pregnancy “eating everything that wasn’t nailed down,” Swanson is now limited to only 1,000 calories a day (most diets allow at least 1,200), comprised of five Medifast “meal replacement” foods – such as powdered scrambled eggs and broccoli soup – and one “real meal” of, say, grilled fish and steamed veggies.

But Swanson is confident she’ll stick to the diet plan, citing a special motivation: “Once I’ve lost a few pounds and can fit into something,” Swanson says she will walk down the aisle with Eisler, most likely in October. [via]